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I'm looking to purchase/have installed a Trane XV90. The sales person was looking carefully where to run the air in/exhaust line(s) (not sure if these are the correct terms). Because of an electrical meter, ductwork from the furnace, water faucet, clothes dryer vent, and where there was some hope, our windows in our kitchen where he thought the exhaust would be to close.

To make a long story short, he felt the best place to run the lines were on the other side of the cellar and out. The run would be quite long (approx 25-30FT) to the outdoors. He seemed to being very careful and mentioned about calculations that determined the width of the pipe he has to run based on length, how many elbows, the rise necessary, etc.

Bottom line question....does this length of run effect the efficiency or any element of the operation of the xv90 versus a shorter run?